E book viewer autoscroll3/20/2023 With so many eReader platforms available, students have a wide variety of options to choose from. can all be found in one small compact device- the eBook.Īll possible learning content can be put together in the eBook, making the learning process as convenient as possible for the students. What could be better than finding all your needs at one place? Your notes, reference materials, annotation tools, etc. NOTE: The property sv could be moved to avoid repeated work.Educational institutes introduced eBooks in classrooms because they want the students to have a holistic learning experience. public static T FindVisualChild(this DependencyObject depObj) where T : DependencyObject Place it in a static class of your choice and add reference to code above. Private void XBTNPageDown_MouseUp(object sender, MouseButtonEventArgs e) PageDownTimer.Interval = new TimeSpan(0, 0, 0, 0, 30) Private void XBTNPageDown_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) Private DispatcherTimer pageDownTimer = new DispatcherTimer() For the Row Definition for the DataGrid (the third row in this case), I set the Height at 150, and the scrollbar works.Īuto Scrolling for as long as the the mouse button is down on a button control. If (m圜ollectView.CurrentPosition collectionĭo follow the previous advice and keep the DataGrid by itself and not in a stack panel. Private void OnMoveDown(object sender, RoutedEventArgs e) TheDataGrid.ScrollIntoView(m圜ollectView.CurrentItem) ICollectionView m圜ollectView = CollectionViewSource.GetDefaultView(Orders) I too was faced with a task of slapping together a WPF program that I need to programmically to move up and down on the DataGrid using buttons since I needed to put it on a resistive touchscreen ONLY for the production builders \t my company, and there's no mouse or keyboard for them to use.īut this example worked for me using the ScrollIntoView method as previously mentioned in this post: private void OnMoveUp(object sender, RoutedEventArgs e) I had the same problem as well when I was learning about Collection Views about doing DataContext in WPF. If the entire contents fit on the screen, ignore this event private void control_ScrollChanged(object sender, ScrollChangedEventArgs e) Here's an example implementation that keeps the bottom item in view as new items are added to the DataGrid, unless the user moves the scrollbar to view items higher up in the grid. Note that these are typically measured in numbers of rows/columns when using the default DataGrid virtualization settings. The ScrollChangedEventArgs object has various properties that can be helpful for computing layout and scroll position (Extent, Offset, Viewport). I've found that the easiest way to do this is to call the ScrollIntoView method from the ScrollViewer.ScrollChanged attached event. Return (bool)element.GetValue(AutoscrollProperty) Public static bool GetAutoscroll(DependencyObject element) Public static void SetAutoscroll(DependencyObject element, bool value)Įlement.SetValue(AutoscrollProperty, value) Private static void ScrollToEnd(DataGrid datagrid)ĭatagrid.ScrollIntoView(datagrid.Items) Private static void DataGridOnUnloaded(object sender, RoutedEventArgs routedEventArgs) Private static void DataGridOnLoaded(object sender, RoutedEventArgs routedEventArgs) ((INotif圜ollectionChanged)dataGrid.Items).CollectionChanged -= handler HandlersDict.TryGetValue(dataGrid, out handler) Notif圜ollectionChangedEventHandler handler Private static void Unsubscribe(DataGrid dataGrid) ((INotif圜ollectionChanged)dataGrid.Items).CollectionChanged = handler Var handler = new Notif圜ollectionChangedEventHandler((sender, eventArgs) => ScrollToEnd(dataGrid)) Private static void Subscribe(DataGrid dataGrid) Throw new InvalidOperationException("Dependency object is not DataGrid.") ![]() Var dataGrid = dependencyObject as DataGrid Private static void AutoscrollChangedCallback(DependencyObject dependencyObject, DependencyPropert圜hangedEventArgs args) Private static readonly Dictionary handlersDict = new Dictionary() "Autoscroll", typeof(bool), typeof(DataGridBehavior), new PropertyMetadata(default(bool), AutoscrollChangedCallback)) Public static readonly DependencyProperty AutoscrollProperty = DependencyProperty.RegisterAttached( I've written an attached property for grid autoscroll: using System
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